The author seems to subscribe to the holy church of the sandbox security theater ;)
They add an incredible amount of complexity and thus potential security issues to a system while making the users and system designers think it is ok to run a malware distribution channel as the primary update mechanism (i.e. the Playstore).
I am not against sandboxes in general (it is for example good to have the javascript code sandboxed in a browser), but all to often they are used to justify the implementation of much more fundamental security issues.
Most security issues are social issues anyways and not really technical.